My Inquiry
My Account
NXP Semiconductors PCA9665PW/S911,118
- Part No.:
- PCA9665PW/S911,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PCA9665PW/S911,118.pdf
- Description:
- IC CNTRLR PARALLEL/I2C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,923
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PCA9665PW/S911,118 from NXP Semiconductors is a Fast-mode Plus (Fm+) parallel-bus-to-I²C-bus controller IC that serves as a bidirectional protocol bridge between 8-bit parallel microcontrollers and the I²C-bus. It operates as master or slave, supports 1 Mbit/s data rates, delivers up to 25 mA drive on SCL/SDA, and integrates a 68-byte buffer for buffered-mode transfers. It is used in industrial control modules where legacy parallel interfaces require I²C expansion without timing-critical external oscillators.
For engineers reviewing the PCA9665PW/S911,118 datasheet, PCA9665PW/S911,118 pinout, PCA9665PW/S911,118 application, or PCA9665PW/S911,118 equivalent, this device enables deterministic I²C bus arbitration, software-initiated reset via parallel bus, General Call support, and 5 V-tolerant I/Os - all while operating from 2.3 V to 3.6 V supply with internal oscillator trimming.
Technical Context
The PCA9665PW/S911,118 implements full I²C-bus protocol handling-including START/STOP generation, arbitration, ACK/NACK management, and clock stretching-without external timing components. Its internal oscillator (28.5 MHz typical) drives all timing-critical functions, and register access is split across four direct registers (selected by A0/A1) and seven indirect registers accessed via INDPTR.
It supports two operational modes: Byte mode (single-byte transfers) and Buffered mode (up to 68 bytes), both configurable via the MODE bit in I2CCON. The device uses open-drain SCL/SDA outputs with 25 mA sink capability, enabling robust Fm+ operation on loaded buses, and includes dedicated hardware for timeout detection, forced bus access recovery, and glitch-free restart (in PCA9665A variant).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Speed Mode | Fast-mode Plus (Fm+), supporting 1 Mbit/s - enables high-speed sensor/EEPROM interfacing without bus contention. |
| Supply Voltage | 2.3 V to 3.6 V - compatible with modern low-voltage microcontrollers and eliminates level-shifting in 3.3 V systems. |
| SCL/SDA Drive | 25 mA sink per line - ensures reliable signal integrity on buses with ≥200 pF capacitance and multiple slaves. |
| Data Buffer | 68-byte FIFO - reduces CPU overhead during bulk transfers (e.g., display frame buffer writes or firmware updates). |
| I/O Tolerance | 5 V tolerant - allows direct connection to 5 V logic without external translators, simplifying mixed-voltage board design. |
| Oscillator Accuracy | ±15 % trimmed internal oscillator - removes need for external crystal/capacitors, saving PCB area and BOM cost. |
| Operating Temp | −40 °C to +85 °C - qualified for industrial ambient environments including factory automation and building controls. |
Pinout & Package
TSSOP20 package (SOT360-1): plastic thin shrink small outline, 20 leads, 4.4 mm body width, lead pitch 0.65 mm, exposed pad not present (HVQFN20 has exposed pad; TSSOP20 does not).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Parallel data bus I/O | Bidirectional 3-state interface to CPU data bus; D0 = LSB; enables byte-aligned command/data/status exchange. |
| A0, A1 | Register address select | Directly selects among five parallel-accessible registers (I2CSTA, INDPTR, I2CDAT, I2CCON, INDIRECT) without address decoding logic. |
| RD, WR, CE | Parallel bus control | Standard 8080-style strobes; CE enables D0–D7 tristate; RD/WR edges latch data - no glue logic required for 8-bit MPU interfacing. |
| INT | Interrupt request output | Active-low open-drain signal indicating I²C state change (e.g., byte received, STOP detected); requires external pull-up. |
| RESET | Hardware reset input | Active-low asynchronous reset clearing all registers and halting I²C state machine - used for safe bus recovery. |
| SCL, SDA | I²C-bus interface | Open-drain bidirectional lines with 25 mA sink; require external pull-ups; support Fm+ timing and multi-master arbitration. |
| VDD, VSS | Power supply | 2.3–3.6 V digital supply and ground; decoupling capacitor placement near VDD/VSS pins critical for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Parallel-to-I²C protocol conversion | Full hardware implementation of I²C master/slave logic, eliminating firmware overhead for START/STOP/ACK timing and arbitration. |
| Software reset capability | Write to I2CPRESET register resets internal state machine and clears all registers - enables safe recovery without power cycle. |
| I²C General Call support | Configurable via GC bit in I2CADR; allows broadcast commands to all devices on bus (e.g., global calibration or sleep entry). |
| Buffered transfer mode | 68-byte FIFO enables burst reads/writes (e.g., reading 64-byte sensor register map) with single CPU interrupt per transaction. |
| ESD & latch-up robustness | ≥2000 V HBM / ≥1000 V CDM ESD rating and >100 mA latch-up immunity - ensures reliability in handling-sensitive industrial assembly. |
Applications
| Industrial PLC I/O Expansion | Smart Sensor Hub Interface |
|---|---|
|
Use Scenario: Adding isolated I²C ports to a legacy 8-bit microcontroller-based programmable logic controller for connecting temperature, pressure, and humidity sensors. IC Role / Device Role / Timing Role: Parallel-bus-to-I²C bridge acting as I²C master to scan multiple slave sensors, managing clock stretching and arbitration autonomously. Use Value: Eliminates need for FPGA or additional MCU; 68-byte buffer reduces polling frequency by >80% during multi-register sensor reads. |
Use Scenario: Central hub in a battery-powered environmental monitor aggregating data from 12+ I²C sensors before transmitting via UART to host MCU. IC Role / Device Role / Timing Role: I²C master with software-controlled timeout and forced bus access, ensuring recovery from stuck SCL conditions in field-deployed units. Use Value: Internal 28.5 MHz oscillator guarantees consistent 1 Mbit/s timing across temperature; 5 V-tolerant I/Os simplify integration with mixed-voltage sensor array. |
| Legacy Display Controller Bridge | EEPROM Configuration Manager |
|
Use Scenario: Interfacing an older 8051-based display driver IC (no native I²C) to OLED or segment LCD modules requiring I²C initialization and pixel data streaming. IC Role / Device Role / Timing Role: Parallel-bus slave to 8051, I²C master to display - handles display-specific timing sequences (e.g., command/data toggle, delay insertion) via register programming. Use Value: 25 mA SCL/SDA drive sustains signal integrity over 15 cm flex cable runs; buffered mode enables full-screen refresh with <3 CPU interrupts. |
Use Scenario: Managing configuration EEPROMs (e.g., 24AA02E48) in network switch line cards, where parallel-bus host writes calibration data and reads MAC addresses. IC Role / Device Role / Timing Role: I²C master with General Call support to simultaneously write protection bits across multiple EEPROMs during manufacturing test. Use Value: Software reset via parallel bus allows EEPROM re-initialization without disrupting other system functions; ±15 % oscillator tolerance meets EEPROM write-cycle timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel-to-I²C interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9665APW | PCA9665A variant with 'glitch-free' restart logic; internal oscillator trimmed to 32 MHz (vs. 28.5 MHz); same TSSOP20 package. | Better suited for systems using buffer drivers where restart transients must avoid false SCL/SDA glitches. | Select PCA9665APW when driving long traces or capacitive loads where restart stability is critical; otherwise PCA9665PW/S911,118 suffices. |
| PCA9564PW | Legacy predecessor; supports only Standard/Fast-mode (400 kbit/s max); 32-byte buffer; no General Call or software reset register. | Limited to lower-speed I²C peripherals; lacks Fm+ drive strength and advanced recovery features. | Choose PCA9564PW only if existing firmware relies on its register map and 1 Mbit/s speed is unnecessary. |
Compared with PCA9665APW, PCA9665PW/S911,118 offers identical pinout and core functionality but trades glitch-free restart for slightly lower oscillator frequency - making it optimal for cost-sensitive industrial controllers where restart robustness is secondary to BOM simplicity. Versus PCA9564PW, it adds 1 Mbit/s speed, 68-byte buffering, and General Call - enabling next-generation sensor aggregation.
Availability
PCA9665PW/S911,118 is available at Aetrix Electronics and suitable for industrial PLCs, smart sensor hubs, legacy display interfaces, and EEPROM configuration managers requiring stable component supply across extended product lifecycles.
Supply support for PCA9665PW/S911,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in interface, power, and security ICs.
The PCA9665 series belongs to NXP's I²C-bus controller product line, designed specifically to extend parallel-bus microcontrollers into I²C ecosystems - emphasizing protocol offload, robust bus recovery, and minimal external component count.
FAQ
What is the maximum I²C data rate supported by the PCA9665PW/S911,118?
The PCA9665PW/S911,118 supports Fast-mode Plus (Fm+) operation up to 1 Mbit/s. This is enabled by its 25 mA SCL/SDA sink capability and internal timing generator, allowing reliable communication with high-capacitance buses or multiple slaves without external clock sources. The PCA9665PW/S911,118 achieves this speed while maintaining full protocol compliance including arbitration and clock stretching.
Does the PCA9665PW/S911,118 require an external crystal or oscillator?
No, the PCA9665PW/S911,118 integrates a trimmed internal oscillator (28.5 MHz typical) that drives all I²C timing functions. This eliminates the need for external crystals, capacitors, or clock generators, reducing BOM count and PCB footprint. Oscillator accuracy is ±15 %, sufficient for Fm+ timing budgets and validated across −40 °C to +85 °C operation.
How does the 68-byte buffer in the PCA9665PW/S911,118 improve system performance?
The 68-byte buffer in the PCA9665PW/S911,118 enables Buffered mode transfers, allowing the host CPU to issue a single read/write command for up to 68 bytes - drastically reducing interrupt overhead and bus arbitration cycles. For example, reading a full 64-byte sensor register map requires only one CPU interrupt instead of 64, improving real-time response in time-constrained industrial applications using the PCA9665PW/S911,118.
Can the PCA9665PW/S911,118 interface with 5 V I²C peripherals?
Yes, the PCA9665PW/S911,118 features 5 V-tolerant I/Os on its parallel bus (D0–D7, A0, A1, RD, WR, CE, INT, RESET) and I²C lines (SCL, SDA). This allows direct connection to 5 V logic without level shifters, simplifying design when interfacing with legacy 5 V microcontrollers or I²C peripherals - a key advantage confirmed in the PCA9665PW/S911,118 datasheet.
What is the purpose of the I2CPRESET register in the PCA9665PW/S911,118?
The I2CPRESET register in the PCA9665PW/S911,118 provides software-initiated reset functionality: writing to this indirect register clears all internal registers, resets the I²C state machine, and returns the device to idle state - equivalent to asserting the hardware RESET pin. This enables safe bus recovery and configuration reload without power cycling, a critical feature for remote or sealed-system deployments using the PCA9665PW/S911,118.
PCA9665PW/S911,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Programmable:
- Not Verified
- Protocol:
- I2C
- Function:
- Controller
- Interface:
- Parallel
- Standards:
- -
- Voltage - Supply:
- 2.3V ~ 3.6V
- Current - Supply:
- 100µA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-TSSOP
- Grade:
- -
- Qualification:
- -
PCA9665PW/S911,118 FAQ
1.How can I place an order for PCA9665PW/S911,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9665PW/S911,118 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PCA9665PW/S911,118 reliable?
The price and inventory of PCA9665PW/S911,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9665PW/S911,118 is usually 5 days.
3.What payment methods are accepted for PCA9665PW/S911,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9665PW/S911,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9665PW/S911,118?
PCA9665PW/S911,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9665PW/S911,118 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PCA9665PW/S911,118?
For technical support, including PCA9665PW/S911,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9665PW/S911,118 requirements.
6.How does Aetrix verify that PCA9665PW/S911,118 is sourced from the original manufacturer or authorized distributors?
All PCA9665PW/S911,118 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PCA9665PW/S911,118 meets industry standards.
7.What is the process for return or replacement of PCA9665PW/S911,118?
All PCA9665PW/S911,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9665PW/S911,118, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PCA9665PW/S911,118 part is unused and in its original packaging.
Return procedure for PCA9665PW/S911,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9665PW/S911,118 Tags
-
PTN5150AHXMP
NXP Semiconductors
-
USB3740B-AI9-TR
Microchip Technology
-
USB3740B-AI2-TR
Microchip Technology
-
USB3300-EZK-TR
Microchip Technology
-
USB3300-EZK
Microchip Technology
-
FUSB340TMX
onsemi
-
FUSB302BMPX
onsemi
-
DP83826IRHBR
Texas Instruments
-
MCP2518FDT-E/QBB
Microchip Technology
-
FUSB302MPX
onsemi
-
MCP2518FDT-E/SL
Microchip Technology
-
FT260Q-R
FTDI, Future Technology Devices International Ltd
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
